Open AccessSimulations of EBW current drive and power deposition in the WEGA Stellarator
Author(s) -
J. Preinhaelter,
J. Urbán,
H. P. Laqua,
Y. Podoba,
Linda Vahala,
George Vahala,
V. Bobkov,
J.-M. Noterdaeme
Publication year - 2009
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.3273788
Subject(s) - stellarator , computational physics , current (fluid) , deposition (geology) , power (physics) , ray tracing (physics) , physics , electron , plasma , nuclear engineering , atomic physics , materials science , optics , nuclear physics , engineering , thermodynamics , paleontology , sediment , biology
The WEGA stellarator [1] is well suited for fundamental electron Bernstein wave (EBW) studies. Heating and current drive experiments at 2.45 GHz and 28 GHz, carried out in WEGA’s low temperature, steady state overdense plasmas, were supported by intensive modelling. We employ our AMR (Antenna—Mode‐conversion—Ray‐tracing) code [3] to calculate the O‐X‐EBW conversion efficiency with a full‐wave equation solver, while the power deposition and current drive profiles using ray tracing. Several phenomena have been studied and understood. Particularly, EBW current drive was theoretically predicted and experimentally detected at 2.45 GHz. Simulations confirmed the presence of two (cold and hot) electron components and the resonant behaviour of the EBW power deposition and its dependence on the magnetic field configuration. Furthermore, the code is used to predict the 28 GHz heating and current drive performance and to simulate EBW emission spectra.
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